Bonus clue: This man was known professionally by two different names. His real name was the one he generally used, but he used a pseudonym on various occasions, especially later in life.
Best
Rob
Abraham Lincoln is the only man, dead or alive, with whom I could have spent five years without one hour of boredom.
--Ida M. Tarbell
I want the respect of intelligent men, but I will choose for myself the intelligent.